the fbi and local turkish police have joined the search for the 33-year-old wife and mother of two. she was last seen leaving her istanbul hostel for dinner monday night and seems to have vanished, leaving her passport, clothing and phone chargers. family members tell fox newschannel, sierra is a photographer and she left her staten island home to take pictures in istanbul, january 7. she checked in with them frequently, texting her family and skyping with her two children daily. her sister received a text from her monday morning, but no one has heard from her since. she was planning to return home on tuesday, january 25. but she missed her family and decided to move up her flight to the 22nd. when her husband went to pick her up, she never showed. >> you know, you have so many stories going through your mind, you don't know what to think, you don't know what to believe. you don't know what to expect. you don't know what's going to come out of this. >> reporter: steven is traveling to turk tow meet with the local authorities. the couple have been married 14 years and they have two c